Beiträge zur Neutronenphysik des Kugelhaufenreaktors

Fröhling, W.

Book/Report

FZJ-2016-02806

Beiträge zur Neutronenphysik des Kugelhaufenreaktors

Fröhling, W. (Corresponding author)FZJ*

1971
Kernforschungsanlage Jülich, Verlag Jülich

Jülich : Kernforschungsanlage Jülich, Verlag, Berichte der Kernforschungsanlage Jülich 771, 66 p. (1971)

Please use a persistent id in citations: http://hdl.handle.net/2128/11323

Report No.: Juel-0771-RG

Abstract: The first chapter of this study involves problems an absorber rods calculations, the second chapter involves problems an the local dependence of the neutron spectrum. 1. The program-cycle KUP0MINOTAUR is decribed for the calculation of boundary conditions of absorber regions in diffusion regions. The application of the program considers first the reactivity of absorber rods of the AVR reactor at Jülich ; here, the threedimensional problems of the inserted absorber-rod Bank is transformed by the ring model into a two-dimensional one . Values were calculated for different burn-up conditions of the core, and they are in good accordance with the measured values . For some HTR cores is studied the mutual interdependence of control rods, the reactivity worth versus insertion depth, and the influenceof the rod diameter . For a global characterization of absorber rod Systems in HTR cores, the term "absorber surface density A" is proposed . The connection between A and shut-down reactivity $\rho$ is already available for some HTR reactors, and therefore can be used for the estimation of the required number of control rods for new core designs. 2. Description of a program-cycle for considering local variation in temperature and buckling by dividing the reactor core into an optional number of spectral zones . Investigation of the influence of local-dependent spectrum calculations by the example of the AVR reactor. lt is shown that the local dependence of the buckling is of little importance compared to that of temperature . The influence of spectral zones to the calculation of keff, of power density distribution, temperature distribution, and burn-up behavior is discussed . The program-cycle considered here permits also to calculate the temperature coefficient . Such a calculation has been performed for the primary core of the AVR ; the results Show good accordance with the measured values.

Contributing Institute(s):